A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

• Correct answer
  A

  Both the scales read $\mathrm{M} \mathrm{kg}$ each
• B

  The scale of the lower one reads $\mathrm{M} \mathrm{kg}$ and of the upper one zero
• C

  The reading of the two scales can be anything but the sum of the reading will be $\mathrm{M} \mathrm{kg}$
• D

  Both the scales read $\mathrm{M} / 2 \mathrm{~kg}$ each

Hence, the correct answer is option: 'A'.